Family name Sillasen (Sillasen 
) , worldwide, is a very rare last name. The surname Sillasen is characteristic of Denmark, where it is a rare surname, the United States, where it is a very rare surname, and Canada, where it is an extremely rare surname.
| VARIANT | COUNTRY |
|---|---|
| Sillasen | Brazil, United States, Denmark, Canada |
Kim, Brett, Kevin, Debra, David, Grete, Jacob, Jason, Erica, Verna, Wayne, Martin, Sandra, Robert, Robena, Regina, Louise, Thomas, Nathan, Victor, Matthew, Seajaye, Brian, Barbara, Becky, Allen, Jim, Tom, Mark, Matt, Anna, Anne, Brad, Bill, Poul, Ryan, Dawn, Doug, Gary, Lene, John, Joan, Jens, Tara, Erin, Marie, Marty, Craig, and Kristin